Estimation of the compression behaviour of reconstituted clays
Estimation of the compression behaviour of reconstituted clays
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DOI：
10.1016/j.enggeo.2013.10.015
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发表时间：
2013-12
影响因子：
7.4
通讯作者：
Martin D. Liu;Ziling Zhuang;S. Horpibulsuk
中科院分区：
文献类型：
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作者：
Martin D. Liu;Ziling Zhuang;S. Horpibulsuk
空隙指数是测量粘土的当前空隙比相对于在两个特定垂直有效应力下的粘土的空隙比的位置的相对量（即，σv′ = 100 kPa和σv′ = 1000 kPa）。基于这一概念，提出了一个简单的系统的工具，用于估计在很宽的范围内的应力和含水量的重塑粘土的压缩行为。根据岩土工程计算的实际，将粘土的压缩特性理想化为Iv ~ lnp′（或孔隙指数和平均有效应力）空间中的线性段。考虑到现有数据的变化，有三个相关但独立的模型来描述重塑粘土的压缩行为。估计的准确性随着可用数据的水平而提高。建议的估计是用来模拟各种再造粘土在很宽的范围内的应力和含水量的行为。使用不同水平的可用数据，根据这些模拟来评估估计。建议的估计可以最大限度地利用现有的数据，并提供了一个简单而实用的工具，用于计算重塑粘土的压缩特性和岩土工程计算的基本参数，压缩指数。本文还提出并验证了初始压缩指数的经验公式。
The void index is a relative quantity measuring the position of the current void ratio of a clay against the void ratios of the clay at two specific vertical effective stresses (i.e., σv′ = 100 kPa and σv′ = 1000 kPa). Based on this concept, a simple systematic tool is proposed for estimating the compression behaviour of reconstituted clays over a wide range of stresses and water contents. Following the practice of geotechnical engineering computation, the compression behaviour of clays is idealised as linear segments in theIv~ lnp′ (or the void index and the mean effective stress) space. Considering the variation in the available data, there are three related but independent models for describing the compression behaviour of reconstituted clays. The accuracy of estimation increases with the level of available data. The proposed estimation is used to simulate the behaviour of a variety of reconstituted clays over a wide range of stresses and water contents. With different levels of available data, the estimation is evaluated on the basis of these simulations. The proposed estimation can take maximum use of available data and provide a simple yet practical tool for calculating the compression behaviour of reconstituted clays and a basic parameter for geotechnical engineering computations, the compression index. An empirical equation for the initial compression index is also suggested and verified.